With the branch's creation and success the UNSC began handing out contracts to various corporations to produce the expensive Second Generation of MJOLNIR armor. In May of 2553, the Materials Group created the Damascus Ordnance Commission to organize these companies in the production of these armors.[9]

When the UNSC Infinity crashed landed on Requiem, the SPARTANs were deployed to fight off attacking Prometheans.[10] Other Spartans were then deployed with John-117 to take down the planet's gravity well and particle canon network.[11] Once it was destroyed, the Infinity escaped Requiem.[12]

Infinity would return to Requiem several months later beginning a new series of Spartan operations.[13]

Similar to other military branches, the Spartan Branch has a multitude of roles. These roles include reconnaissance,[16] security and patrol,[17] counter insurgency,[18]military police duties,[19] high value asset retrieval,[20] and frontline combat.[21]

The ranking system of the Spartan branch only applies to Spartan-IVs, while Spartan-IIs and Spartan-IIIs still retain their ranks. All Spartan-IVs share the same rank of Spartan and do not possess any formal ranks.[25] However, the title of Spartan Commander exists. They managed Spartan contingents on UNSC Starships.[9]